flotsam and jetsam

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun nautical The remains of a shipwreck still floating in water.
• noun nautical That which has been discharged from a ship or boat, especially on the ocean or a sea, (flotsam unintentionally and jetsam intentionally).
• noun figuratively A collection of miscellaneous items or fragments of little importance.
• noun figuratively People considered to be of little worth.